This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 216 |
| 3 | 3430 |
| 4 | 61440 |
| 5 | 1240029 |
| 6 | 28000000 |
| 7 | 701538156 |
| 8 | 19349176320 |
| 9 | 583247465515 |
| 10 | 19090807228416 |
| 11 | 674680957031250 |
| 12 | 25614222880669696 |
| 13 | 1039980693455123385 |
| 14 | 44977604109849722880 |
| 15 | 2064633276062972568664 |